package com.xiaolun.netty.heartbeat;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.timeout.IdleStateHandler;

import java.util.concurrent.TimeUnit;

public class MyServer {
	public static void main(String[] args) throws Exception {
		//创建两个线程组
		EventLoopGroup bossGroup = new NioEventLoopGroup(1);
		EventLoopGroup workerGroup = new NioEventLoopGroup(); //8个NioEventLoop
		try {
			ServerBootstrap serverBootstrap = new ServerBootstrap();
			serverBootstrap.group(bossGroup, workerGroup);
			serverBootstrap.channel(NioServerSocketChannel.class);
			// 增加一个日志处理器
			serverBootstrap.handler(new LoggingHandler(LogLevel.INFO));
			serverBootstrap.childHandler(new ChannelInitializer<SocketChannel>() {

				@Override
				protected void initChannel(SocketChannel ch) throws Exception {
					ChannelPipeline pipeline = ch.pipeline();
					/**
					 * 加入一个netty 提供 IdleStateHandler
					 *   说明
					 *   1. IdleStateHandler 是netty 提供的处理空闲状态的处理器
					 *   2. long readerIdleTime : 表示多长时间没有读（Server没有读取Client发送的数据）, 就会发送一个心跳检测包检测是否连接
					 *   3. long writerIdleTime : 表示多长时间没有写, 就会发送一个心跳检测包检测是否连接
					 *   4. long allIdleTime : 表示多长时间没有读写, 就
					 *   5. 文档说明
					 *         triggers an {@link IdleStateEvent} when a {@link Channel} has not performed read, write, or both operation for a while.
					 *   6. 当 IdleStateEvent 触发后 , 就会传递给管道 的下一个handler去处理
					 *  通过调用(触发)下一个handler 的 userEventTiggered , 在该方法中去处理 IdleStateEvent(读空闲，写空闲，读写空闲)
					 */
					pipeline.addLast(new IdleStateHandler(3, 5, 7, TimeUnit.SECONDS));
					//加入一个对空闲检测进一步处理的handler(自定义)
					pipeline.addLast(new MyServerHandler());
				}
			});

			//启动服务器
			ChannelFuture channelFuture = serverBootstrap.bind(7000).sync();
			channelFuture.channel().closeFuture().sync();

		} finally {
			bossGroup.shutdownGracefully();
			workerGroup.shutdownGracefully();
		}
	}
}
